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LT1228

更新时间： 2023-12-20 18:45:10
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
22页 665K
描述
具 DC增益控制功能的 100MHz 电流反馈放大器

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中文翻译

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LT1228 数据手册

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LT1228  
100MHz Current Feedback  
Amplifier with DC Gain Control  
FEATURES  
DESCRIPTION  
The LT®1228 makes it easy to electronically control the  
gain of signals from DC to video frequencies. The LT1228  
implements gain control with a transconductance ampli-  
fier (voltage to current) whose gain is proportional to an  
externally controlled current. A resistor is typically used  
to convert the output current to a voltage, which is then  
amplified with a current feedback amplifier. The LT1228  
combinesbothamplifiersintoan8-pinpackage, andoper-  
ates on any supply voltage from 4V ( 2V) to 30V ( 1ꢀV).  
A complete differential input, gain controlled amplifier can  
be implemented with the LT1228 and just a few resistors.  
n
Very Fast Transconductance Amplifier  
Bandwidth: 7ꢀMHz  
g = 10 × I  
m
SET  
Low THD: 0.2% at 30mV  
Input  
RMS  
Wide I Range: 1µA to 1mA  
SET  
n
Very Fast Current Feedback Amplifier  
Bandwidth: 100MHz  
Slew Rate: 1000V/µs  
Output Drive Current: 30mA  
Differential Gain: 0.04%  
Differential Phase: 0.1°  
High Input Impedance: 2ꢀMΩ, 6pF  
Wide Supply Range: 2V to 1ꢀV  
Inputs Common Mode to Within 1.ꢀV of Supplies  
Outputs Swing Within 0.8V of Supplies  
Supply Current: 7mA  
TheLT1228transconductanceamplifierhasahighimped-  
ancedifferentialinputandacurrentsourceoutputwithwide  
n
n
n
n
n
output voltage compliance. The transconductance, g , is  
m
setbythecurrentthatflowsintoPinꢀ,I .Thesmallsignal  
SET  
g isequaltotentimesthevalueofI andthisrelationship  
m
SET  
Available in 8-Lead PDIP and SO Packages  
holds over several decades of set current. The voltage at  
Pin ꢀ is two diode drops above the negative supply, Pin 4.  
APPLICATIONS  
TheLT1228currentfeedbackamplifierhasveryhighinput  
impedanceandthereforeitisanexcellentbufferfortheout-  
putofthetransconductanceamplifier.Thecurrentfeedback  
amplifiermaintainsitswidebandwidthoverawiderangeof  
voltage gains making it easy to interface the transconduc-  
tance amplifier output to other circuitry. The current feed-  
back amplifier is designed to drive low impedance loads,  
suchascables,withexcellentlinearityathighfrequencies.  
n
Video DC Restore (Clamp) Circuits  
n
Video Differential Input Amplifiers  
n
Video Keyer/Fader Amplifiers  
n
AGC Amplifiers  
n
Tunable Filters  
n
Oscillators  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Frequency Response  
6
Differential Input Variable Gain Amp  
V
=
15V  
S
L
R
= 100Ω  
3
0
15V  
4.7µF  
I
= 1mA  
SET  
+
R3A  
–3  
10k  
7
4
3
2
+
–
+
–6  
1
8
g
R2A  
10k  
V
m
+
–
IN  
–9  
6
I
I
= 300µA  
SET  
V
–
5
CFA  
OUT  
–12  
–15  
–18  
I
SET  
R
F
–15V  
R2  
470Ω  
R4  
1.24k  
R5  
R3  
100Ω  
= 100µA  
1M  
4.7µF  
10k  
SET  
+
100Ω  
R1  
270Ω  
R
G
–21  
–24  
HIGH INPUT RESISTANCE  
EVEN WHEN POWER IS OFF  
–18dB < GAIN < 2dB  
10Ω  
R6  
6.19k  
100k  
10M  
100M  
V
≤ 3V  
IN  
RMS  
LT1228 • TA02  
LT1228 • TA01  
FREQUENCY (Hz)  
1228fd  
1
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中文翻译

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